During acceleration the speeds can be considered minimum retraction to next config speeds. Aircraft should show +ve speed trend.
On deceleration they are manoeuvring/managed target speeds. You can always still reduce to VLS but lose the manoeuvring margins.
For normal approaches.
Config 1 = Slats 1 only. Target speed is S
Config 2 = Full slats, Flap = 2. Target speed is F. (This is a big change and the acft balloons).
Config 3 = Flap = 3. Target speed is still F
Config Full = Flap = Full. Target speed reduces to Vapp.
Hope that helps.